Compaq Presario F551AU to XP Pro problems

Hi guys. Have a quick question.
My Compaq Presario f500, will NOT pick up a driver.
It was windows Vista, then I put on xp pro.
Files and drivers did not pick up. Alot of googleing, I did get some the drivers for alot of them.
Then I flip the machine over, where is say Service tag. I got a F551AU MODEL. tried that but still can not get a driver for UNKNOW.
In the device manager
Under Other Device these a UNKNOWN DEVICE.
The wifi works fine. In fack I'm using the wifi now.
In the device manager
Two(2) item under network adapter
Broadcom 802.11b/g WLAN
&
NVIDIA nForce networking controller
Both are working.